Electeic aeg lamp



(No Model.) 3 Sheets-Sheet 1.

E. P. WARNER. ELECTRIC ARG LAMP.

No. 593,626. PatentedNov. 16, 1897.

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(No Model.) 3 Sheets-Sheet 2.

E. P. WARNER. ELECTRIC ARG LAMP.

PatentedNov. 16, 1897'.

give/2 22g4 sesf v (No Model.) 3 Sheets-Sheet 3.

E. P. WARNER. BLEQTRIC ARG LAMP.

No. 593,626. Patented Nov. 16,1897.

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l I Il Il UNITED STATES PATENT OEErcE.

ERNEST P. VARNER, OE CHICAGO, ILLINOIS, ASSIGNOR TO TI'IE WESTERN ELECTRIC COMPANY, OE SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 593,626, dated November 16, 189'?.

Application filed March 16, 1897.

T0 a/ZZ whom it may con/cern Beit known that I, ERNEST P.. WARNER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Electric-Arc Lamps, (Case No. 64,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to an electric arc lamp, and has for its object to provide improved means for effecting an automatic and regular feeding of the carbons to keep the carbon-points approximately the same distance apart until they are practically consumed.

In arc -lamps where the carbon is suspended from a chain or metallic ribbon it has been difficult to obtain suitable clutching mechanism which will act positively and surely to regulate the distance between the carbon-points. v

In accordance with my invention the chain which upholds the stick of carbon passes over a sprocket-wheel, and electrically-operated clutching mechanism is applied to the latter when the lamp is switched into circuit,where by the wheel is caused to rotate slightly, thus separating the carbons a short distance and establishing the arc. As the carbons are consumed and the resistance 0f the arc becomes greater the clutch mechanism relaxes its hold upon the sprocket-wheel, thus allowing it to be turned freely as the carbon is fed downward by its own weight until the proper length of arc is obtained, whereupon the clutch is caused to engage the sprocket-wheel and preventfurther rotation thereof until the clutch is again caused to relax its hold.

The clutch which I preferably employ consists of two members rotatably mounted, the sprocket-wheel being mounted between them coaxially therewith. The two members are so linked together and mounted that when one of them, which I term the gripping member, is rotated by the operating mechanism of the lamp the link connections cause the members to approach each other, thus clamping the sprocket-wheel rigidly between them and preventing relative movement.

Serial No. 627,794. (No model.)

Upon further rotation of the gripping member the sprocket-wheel and the second or releasing member are caused to rotate therewith. Upon rotation of the gripping member in the opposite direction an arm carried by the releasing member is engaged by a stationary stop, preventing further rotation of the releasing member in that direction. If, now, the gripping member continues to 6o rotate, the link connection between them causes the two members to separate, thus releasing the sprocket-wheel and permitting it to be turned freely.

I will describe the details of my invention more fully by reference to the accompanying drawings, in whichp Figure 1 is an elevation, partly in section, of an arc -lamp embodying my invention. Fig. 2 is a sectional elevation of the operating 7o mechanism. Fig. 3 is a plan view of the clutch Y and adjacent parts. Fig. 4 is a detail plan View of the clutching members in a relaxed condition. Fig. '5 is a sectional plan view thereof. Fig. 6 is a sectional View on line 6 6 75 of Fig. 4.

Similar letters of reference indicate similar parts throughout the several figures.

The carbon a is secured at its upper end to the carbon-clamp a. The chain Z9 is fastened 8o thereto and passes upward over the sprocket- Wheel c and then downward, terminating in a weight d, which is adapted to slide up and down in the tube e. The sprocket-wheel cis mounted with roller-bearings c' c upon the 85 shaft c2, as shown in Fig. 5, and is adapted to be rotated freely thereon, except when engaged by the clutch. The shaft c2 is mounted at either end in supports c8 c4. The clutching mechanism consists of two members, one 9o of which, the gripping-disk f, is mounted to rotate upon the shaft c2 between the sprocketwheel c and the support c3, while the other, the releasing-disk f', is likewise mounted upon the shaft c2 between the sprocket-wheel 95 c and the support c4. Each disk is provided with a carbon face lo 7c', which is brought into frictional engagement with the side of the sprocket-wheel, when the disks are caused to approach each other. Links f2 f2 are proroo Vided,which join the disks ff at two approximately diametrically opposite points.

The cores of the solenoids g g are joined by a yoke-piece g. A link h connects the middle of said yoke-piece with a lug upon the periphery of the gripping-disk f, so that when the yoke is raised the disk is rotated about the shaft c2. Extending outwardly from the periphery of the releasing-disk ,'fand mounted thereon is an arm j, carrying upon its end a weightfl. An additional weight t' is preferably suspended from the weight f by a coiled spring t.

It will be seen that when the solenoids g g are energized, drawing up their cores andthe yokepiece g', the grippingdisk f will be caused to rotate in a clockwise direction, Fig. 2, about the shaft c2. Because of the link connections fzff the releasing-disk f', with the weighted arm mounted thereon, will be rotated also; but the weight ft, tending to rotate the releasing-disk f' in a contra-clockn wise direction, the two disks will be caused to approach each other, their carbon l'aces 7u 7c engaging with the sides of the sprocketwheel c. This prevents movement of thelatter with relation to the disks and causes it to rotate therewith, thus raising the carbon a, through the medium of the chain and es tablishing the are. lVhen the resistance of the are becomes greater, the solcnoids become sulliciently denergized to permit the yoke-piece g'to drop, rotatingr the disk f in a contra-clockwise direction. rlhis will at last canse the weighted arm of the releasing-disk f to be stopped in its downward path by a stop Z, mounted upon the frame of the lamp, preventing further rotation of the disk j in that direction. Upon continued contraclockwise rotation of the disk j" the links f2 f3 will cause the two disks to recede from one another and release their hold upon the sides of the sprocket-wheel, which may then permit the carbon to descend by its own weight. This continues until the are is so shortcned that the solenoids g g are energized to greater strength, when the yoke is again lifted, causing the disks to again engage the sprocket-whcel and check farther descent of Jthe carbon.

lt will be seen that various modifications may be readily made by those skilled in the art, and I do not therefore desire to be understood as limiting myself to the precise construction shown; but,

Having described one form of my invention, I claim as new, and desire to secure by Letters Patent, together with all such modifications as maybe made with mere skill, and

with only those limitations expressed or by law implied in view of the state of the related arts, the following:

l.. In an electric-are lamp, the combination with a chain or ribbon supporting the carbon, of a controlling-wheel over which said chain or ribbon is passed, two rotatable clutching members mounted one at either side oi said controlling-wheel, link connections betweenv said clutching members, whereby independw ent rotation oi one of said members with re lation to the other varies the distance between them, causing engagement or release of said eontrolling-wheel,and electromagnetic means for causing such independent rotation, thereby to effect the regulation oi the lamp, sub stantially as described.

Inafi'iction-clutcli,the combination with a movable element, of clutching members rotatabl Y mounted one at either side thereof, and link connectionsbetween said members, whereby independent rotation oi' one oi said members varies the distance between them, causing engagement or release oi` said mor able element according1 to the direction ol such rotation, substantially as described.

The combination with a wheel whose rotation is to be controlled, oi clutching-disk` ff operatively mounted one on either side of said wheel and coaxially therewith, and link connections between said disks at approximately diametrically opposite points whereby independent rotation oi' the disk j" with relation to the disk j" varies the distance between them, causing them to engage the sides of the wheel and prevent its relative movement, or relax such engagement, according to the direction of rotation oi said disk j', substantially as described.

il. The combination with a wheel whose rotation is to be controlled, of clutching-disks ff operatively mounted one on either side of said wheel and eoaxially therewith, a retarding elemcntfL associated with the disk j", and link connections between said disks at ap proximately diametrieally opposite points,

whereby independent rotation oi' the disk j 

